【单选题】Many people consider the wider use of biofuels a promising way of reducing the amount of surplus carbon dioxide (CO2n) being pumped into the air by the world’s mechanized transport. The theory is that...
A.
burning biofuels does not add CO2n to the atmosphere.
B.
biofuels can slow down the pace of global warming.
C.
biofuels is a promising and profitable form. of green energy.
D.
burning biofuels discharges less N2nO than burning oils.
【单选题】When Adam Smith presented his theory of absolute advantage, he thought that all value was measured in terms of the amount of _______ used in the production of the good.